CN209896429U - Mid-infrared band side pumping optical fiber pumping signal combiner - Google Patents
Mid-infrared band side pumping optical fiber pumping signal combiner Download PDFInfo
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- CN209896429U CN209896429U CN201822196848.2U CN201822196848U CN209896429U CN 209896429 U CN209896429 U CN 209896429U CN 201822196848 U CN201822196848 U CN 201822196848U CN 209896429 U CN209896429 U CN 209896429U
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Abstract
A mid-infrared band side-pumped optical fiber pumping signal combiner. It includes double-clad fiber and at least one pump input fiber; the pump input optical fiber is tapered by utilizing a flame or graphite wire heating mode; the double-clad optical fiber is etched or ground on the inner cladding, and the edge of the inner cladding at the joint area is radially recessed to form at least one notch, so that the cross section at the joint area is polygonal; each tapered pump input fiber is combined in a gap at the combining area on the double-clad fiber in a mode of refractive index matching glue or flame sintering. The utility model discloses the advantage: the manufacturing process is simple, and round or sawtooth gaps matched with pump input fibers of different specifications can be arranged at different parts of the inner cladding of the double-clad fiber so as to manufacture a plurality of beam combiners of different specifications. The pump input optical fiber of the beam combiner can support the transmission of lasers with the wavelength of 793nm, 976mm, 1150nm or 1550 nm.
Description
Technical Field
The utility model belongs to the technical field of the fiber laser, especially, relate to a well infrared band side pumping optical fiber pumping signal beam combiner.
Background
The laser of the mid-infrared band has special important application in the fields of national defense, medical treatment and communication. Because the laser with the wavelength larger than 2 mu m has strong resonance absorption in the silica-based optical fiber, the optical fiber which can support the generation of the intermediate infrared band optical fiber laser and the low-loss transmission at the present stage mainly comprises a fluoride optical fiber, a telluride optical fiber or a sulfide optical fiber. The optical fiber using these materials as matrix has lower phonon energy in 2-5 micron wave band, better solubility to rare earth ion and higher refractive index. At present, an infrared fiber laser in ZBLAN of about 3 mu m is rapidly developing, and is believed to reach hundreds of watts after a while, especially, a cascade Er3+ doped fiber laser has the most prospect due to the low doping concentration and temperature, and a Ho3+ doped fiber laser also has a good application prospect. But is limited by the physical characteristics of the soft glass optical fiber made of non-quartz materials, and a series of key optical fiber devices (such as fiber gratings, beam combiners and collimators) and core technologies of the optical fiber are still lacked.
The existing mid-infrared band beam combiner, such as the mid-infrared band fiber pump/signal beam combiner disclosed in chinese patent application No. 201610786137.3, is an end-pumped structure, which needs tapering the signal fiber, increasing the loss of the signal light, and in addition, when the signal fiber and the output fiber are the same fiber, the beam combiner cannot be made by using the structure, and the beam combiner has no reverse isolation effect; the invention discloses a side-pumped mid-infrared band optical fiber pumping signal beam combiner disclosed in Chinese patent application No. 201610786021.X, which draws a pumping optical fiber to be attached to a signal optical fiber after tapering, and does not process the signal optical fiber, thereby being not beneficial to improving the coupling efficiency; the papers "Fluoride-fiber-based side-pump fiber laser at 2.8 μm, opt.lett.43(10), pp.2040-2043 (2018)", which disclose a side-pump fiber combiner based on Fluoride fiber, however, like the side-pump mid-infrared band fiber pump signal combiner with application number 201610786021.X, the pump fiber is just polished to be tapered and then attached to the signal fiber, the signal fiber is not processed, which is not beneficial to improving the coupling efficiency, and the pump fiber adopts the Fluoride fiber, while the commercially available fiber-coupled semiconductor pump sources all adopt the quartz fiber, which is very difficult to weld with the Fluoride fiber.
Disclosure of Invention
In order to solve the above problem, an object of the present invention is to provide a mid-infrared band side pump optical fiber pump signal combiner with low signal light loss and high pump light coupling efficiency.
In order to achieve the purpose, the mid-infrared band side pumping optical fiber pumping signal beam combiner comprises a double-clad optical fiber serving as a signal optical fiber and at least one pumping input optical fiber; the double-clad optical fiber consists of a fiber core, an inner cladding and an outer cladding; stripping an outer cladding layer at the joint of the double-clad optical fiber and the pump input optical fiber to expose the inner cladding layer at the joint to form a joint area, etching or grinding the inner cladding layer at the joint area to enable the edge of the inner cladding layer at the joint area to be recessed along the radial direction to form at least one notch, and enabling the cross section at the joint area to be polygonal; the pump input optical fiber is tapered by using a flame or graphite wire heating mode; each tapered pump input fiber is combined in a gap at the combining area on the double-clad fiber in a mode of refractive index matching glue or flame sintering.
The cross section of the notch on the inner cladding at the combining area is circular or zigzag.
The pump input optical fiber is a multimode silica optical fiber.
The number of the pumping input optical fibers is one, three or six; when multiple fibers are used, all the pump input fibers are spaced apart at the junction region of the double-clad fiber.
The utility model provides a mid-infrared band optic fibre pumping signal closes bundle ware has following advantage:
the manufacturing process is simple, and round or sawtooth gaps matched with pump input fibers of different specifications can be arranged at different parts of the inner cladding of the double-clad fiber so as to manufacture a plurality of beam combiners of different specifications. The pump input optical fiber of the beam combiner can support the transmission of lasers with the wavelength of 793nm, 976mm, 1150nm or 1550 nm.
The pump input optical fiber is subjected to tapering treatment, and the double-clad optical fiber is treated, so that the contact area and depth of the pump input optical fiber and the double-clad optical fiber and the acting distance of the pump input optical fiber and the double-clad optical fiber on a contact surface are increased, and high-efficiency coupling is easier to realize.
The combination of the double-clad fiber and the pump input fiber does not introduce any deformation to the core of the double-clad fiber, and provides good reverse isolation performance, and can reduce signal insertion loss.
The pump input optical fiber adopts a quartz optical fiber matched with the output optical fiber of the commercial semiconductor pump source, and can realize full optical fiber fusion.
Drawings
Fig. 1 is a longitudinal structural sectional view of a mid-infrared band side pump optical fiber pumping signal combiner provided in embodiment 1 of the present invention.
Fig. 2 is a sectional view taken along line a-a in fig. 1.
Fig. 3 is a longitudinal structural sectional view of a junction region of a mid-infrared band side pump optical fiber pumping signal combiner provided in embodiment 2 of the present invention.
Fig. 4 is a longitudinal structural sectional view of a junction region of a mid-infrared band side pump optical fiber pumping signal combiner provided in embodiment 3 of the present invention.
Fig. 5 is a cross-sectional view of a longitudinal structure at a junction of a mid-infrared band side pump optical fiber pumping signal combiner provided in embodiment 4 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1:
as shown in fig. 1, the mid-infrared band side-pumped fiber pump signal combiner provided in this embodiment includes a double-clad fiber 8 as a signal fiber and at least one pump input fiber 18; the double-clad optical fiber 8 consists of a fiber core 12, an inner cladding 141 and an outer cladding 10; stripping the outer cladding 10 at the joint of the double-clad fiber 8 and the pump input fiber 18 to expose the inner cladding 141 at the joint to form a joint region 26, and etching or grinding the inner cladding 141 at the joint region 26 to make the edge of the inner cladding 141 at the joint region 26 recess along the radial direction to form at least one notch, so that the cross section at the joint region 26 is polygonal; the pump input optical fiber 18 is tapered by means of flame or graphite wire heating; each tapered pump input fiber 18 is bonded to double-clad fiber 8 in a notch at bonding region 26 using index matching glue or flame sintering.
The double-clad optical fiber 8 is an undoped double-clad fluoride optical fiber, and the fiber core 12, the inner cladding 141 and the outer cladding 10 are all made of fluoride glass materials; the numerical aperture of the core 12 of the double-clad optical fiber 8 is between 0.15 and 0.35, and the numerical apertures of the inner cladding 141 and the outer cladding 10 are between 0.4 and 0.7; the diameter of the core 12 ranges from 2.5 to 30 μm, the diameter of the outer cladding 10 ranges from 125 to 600 μm, and the diameter of the inner cladding 141 ranges from 100 to 300 μm.
The double-clad optical fiber 8 is an undoped double-clad telluride optical fiber: the core 12, the inner cladding 141 and the outer cladding 10 are made of telluride glass materials; the numerical aperture of the core 12 of the double-clad optical fiber 8 is between 0.15 and 0.35, and the numerical apertures of the inner cladding 141 and the outer cladding 10 are between 0.4 and 0.7; the diameter of the core 12 ranges from 2.5 to 30 μm, the diameter of the outer cladding 10 ranges from 125 to 600 μm, and the diameter of the inner cladding 141 ranges from 100 to 300 μm.
The double-clad optical fiber 8 is an undoped double-clad sulfide optical fiber: the core 12, the inner cladding 141 and the outer cladding 10 are all made of sulfide glass materials; the numerical aperture of the core 12 of the double-clad optical fiber 8 is between 0.15 and 0.35, and the numerical apertures of the inner cladding 141 and the outer cladding 10 are between 0.4 and 0.7; the diameter of the core 12 ranges from 2.5 to 30 μm, the diameter of the outer cladding 10 ranges from 125 to 600 μm, and the diameter of the inner cladding 141 ranges from 100 to 300 μm.
The pump input fiber 18 is a multimode silica fiber.
As shown in fig. 2, the cross-section of the inner cladding 141 at the junction 26 of the double-clad optical fiber 8 is a polygon with three saw-tooth notches. The edge of the inner cladding 141 on the double-clad fiber 8 is etched or ground into three zigzag gaps along the radial direction, the length is L, the depth is H, the three pumping input fibers 18 are tapered by using flame or graphite wire heating, the tapered length is 2L, the waist length is L, then the waist part of one tapered pumping input fiber 18 is combined with one zigzag gap on the double-clad fiber 8 by using refractive index matching glue or flame sintering, and the (3+1) x 1 optical fiber combiner can be manufactured. In operation, pump light in pump input fiber 18 is gradually coupled through the tapered waist region into inner cladding 141 at the union region 26 of double-clad fiber 8.
Example 2:
as shown in fig. 3, the cross section of the inner cladding 141 at the junction region 26 on the double-clad fiber 8 of the mid-infrared band side-pumped fiber pump signal combiner provided in this embodiment is a polygon with three circular notches. The edge of the inner cladding 141 on the double-clad fiber 8 is etched or ground into three circular notches along the radial direction, the length is L, the depth is H, the three pumping input fibers 18 are tapered by using flame or graphite wire heating, the tapered length is 2L, the waist length is L, then the waist part of one tapered pumping input fiber 18 is combined with one circular notch on the double-clad fiber 8 by using refractive index matching glue or flame sintering, and the (3+1) x 1 fiber combiner can be manufactured. In operation, pump light in pump input fiber 18 is gradually coupled through the tapered waist region into inner cladding 141 at the union region 26 of double-clad fiber 8.
Example 3:
as shown in fig. 4, the cross section of the inner cladding 141 at the bonding region 26 on the double-clad fiber 8 of the mid-infrared band side-pumped fiber pump signal combiner provided in this embodiment is a polygon with six saw-tooth notches. Six saw-tooth-shaped notches with the length of L and the depth of H are etched or ground at equal intervals along the radial direction at the edge of an inner cladding 141 on the double-clad optical fiber 8, the six pump input optical fibers 18 are tapered in a flame or graphite wire heating mode, the tapered length is 2L, the waist length is L, then the waist part of one tapered pump input optical fiber 18 is combined with one saw-tooth-shaped notch on the double-clad optical fiber 8 in a refractive index matching glue or flame sintering mode, and the (6+1) x 1 optical fiber combiner can be manufactured. In operation, pump light in pump input fiber 18 is gradually coupled through the tapered waist region into inner cladding 141 at the union region 26 of double-clad fiber 8.
Example 4:
as shown in fig. 5, the cross section of the inner cladding 141 at the junction region 26 on the double-clad fiber 8 of the mid-infrared band side-pumped fiber pump signal combiner provided in this embodiment is a polygon with six circular notches. The edge of the inner cladding 141 on the double-clad fiber 8 is etched or ground into six circular notches with length of L and depth of H at equal intervals along the radial direction, the six pump input fibers 18 are tapered by means of flame or graphite wire heating, the tapered length is 2L, the waist length is L, then the waist part of one tapered pump input fiber 18 is combined with one circular notch on the double-clad fiber 8 by means of refractive index matching glue or flame sintering, and the (6+1) x 1 fiber combiner can be manufactured. In operation, pump light in pump input fiber 18 is gradually coupled through the tapered waist region into inner cladding 141 at the union region 26 of double-clad fiber 8.
The utility model discloses can make into (N +1) x 1 optical fiber beam combiner by the combination of N pumping input fiber 18 edgewise and double-clad fiber 8. Notches matching pump input fibers 18 of different specifications may also be provided at different locations of inner cladding 141 at the junction region 26 on double-clad fiber 8.
The utility model discloses a with the inner cladding 141 of pump light edgewise coupling entering double-clad fiber 8 to can not harm double-clad fiber 8's fibre core 12, stability is good, has advantages such as reverse isolation.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can make various changes or modifications, and these changes or modifications should be covered by the protection scope of the present invention.
Claims (4)
1. The utility model provides a mid-infrared band side pump optical fiber pumping signal beam combiner which characterized in that: the mid-infrared band side pumping optical fiber pumping signal combiner comprises a double-clad optical fiber (8) used as a signal optical fiber and at least one pumping input optical fiber (18); the double-clad optical fiber (8) consists of a fiber core (12), an inner cladding (141) and an outer cladding (10); stripping an outer cladding (10) at the joint of the double-clad optical fiber (8) and the pump input optical fiber (18), exposing an inner cladding (141) at the joint to form a joint region (26), etching or grinding the inner cladding (141) at the joint region (26), and radially recessing the edge of the inner cladding (141) at the joint region (26) to form at least one notch, so that the cross section at the joint region (26) is polygonal; the pump input optical fiber (18) is tapered by using a flame or graphite wire heating mode; each tapered pump input fiber (18) is bonded in a notch at a bonding region (26) on the double-clad fiber (8) by means of refractive index matching glue or flame sintering.
2. The mid-ir band side pump fiber pump signal combiner of claim 1, wherein: the cross section of the notch on the inner cladding (141) at the combining area (26) is circular or zigzag.
3. The mid-ir band side pump fiber pump signal combiner of claim 1, wherein: the pump input optical fiber (18) is a multimode silica optical fiber.
4. The mid-ir band side pump fiber pump signal combiner of claim 1, wherein: the number of the pumping input optical fibers (18) is one, three or six; when multiple, all pump input fibers (18) are spaced apart at the junction region (26) of the double-clad fiber (8).
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| CN201822196848.2U CN209896429U (en) | 2018-12-25 | 2018-12-25 | Mid-infrared band side pumping optical fiber pumping signal combiner |
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| CN201822196848.2U CN209896429U (en) | 2018-12-25 | 2018-12-25 | Mid-infrared band side pumping optical fiber pumping signal combiner |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494554A (en) * | 2018-12-25 | 2019-03-19 | 山东海富光子科技股份有限公司 | A kind of middle infrared band profile pump optical fiber pumping signal bundling device |
| CN112363277A (en) * | 2021-01-13 | 2021-02-12 | 深圳市星汉激光科技股份有限公司 | Optical fiber beam combining structure and manufacturing method thereof |
| CN113809625A (en) * | 2021-11-18 | 2021-12-17 | 武汉聚合光子技术有限公司 | Side pump combiner for high-power fiber laser system |
-
2018
- 2018-12-25 CN CN201822196848.2U patent/CN209896429U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494554A (en) * | 2018-12-25 | 2019-03-19 | 山东海富光子科技股份有限公司 | A kind of middle infrared band profile pump optical fiber pumping signal bundling device |
| CN112363277A (en) * | 2021-01-13 | 2021-02-12 | 深圳市星汉激光科技股份有限公司 | Optical fiber beam combining structure and manufacturing method thereof |
| CN113809625A (en) * | 2021-11-18 | 2021-12-17 | 武汉聚合光子技术有限公司 | Side pump combiner for high-power fiber laser system |
| CN113809625B (en) * | 2021-11-18 | 2022-02-18 | 武汉聚合光子技术有限公司 | Side pump combiner for high-power fiber laser system |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A mid infrared side pumped fiber pump signal combiner Effective date of registration: 20210517 Granted publication date: 20200103 Pledgee: Weihai City Commercial Bank Limited by Share Ltd. high tech branch Pledgor: HFB Photonics Co.,Ltd. Registration number: Y2021980003674 |
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